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Rehabilitation of Indigenous Browse Plant Species Following Exclosure Established on Communal Grazing Lands in South Tigray

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Rehabilitation of Indigenous Browse Plant Species Following Exclosure Established on Communal Grazing Lands in South Tigray Atsbha et al. Ecological Processes (2019) 8:43 https://doi.org/10.1186/s13717-019-0197-1 RESEARCH Open Access Rehabilitation of indigenous browse plant species following exclosure established on communal grazing lands in South Tigray, Ethiopia, and implication for conservation Tesfay Atsbha*, Solomon Wayu, Nguse Gebretsadkan, Tesfay Gebremariam and Tsgehiwet Giday Abstract Background: Despite the wide use of indigenous browse plant species, there is almost no information on the rehabilitation of indigenous browse species following area exclosure (AE) established on communal grazing lands (CGL) in Southern Tigray. The objectives of this study were to assess the rehabilitation of browse plant species following AE establishment on CGL. A total of 61 and 59 plots of 10 × 10 m2 size were laid down at 50-m intervals along parallel line transects at AE and GCL, respectively. Data collected on vegetation attributes were subjected to analysis of t test (unequal variances) using R-software. Results: The Shannon diversity index of the browse plant species was 1.25 and 0.81 in AE and CGL, respectively (P < 0.001).TheoverallpopulationstructureofbrowseplantspeciesintheAEshowsareverseJ-shapedpopulationcurveand “good” regeneration status, which reveals that the future communities may be sustained. Leaf biomass and basal area of browse plant species were significantly higher in the AE than in CGL (P < 0.001). After exclusion of grazing, AE was found to have positive effects on diversity and aboveground biomass of browse plant species. Conclusions: The study gives an understanding of the diversity, the pattern of population and regeneration of the browse plant species, which may help in the management and conservation of the species. Our results indicate that grazing exclusion is an effective management strategy to restore browse plant species. We concluded that the establishment of AE had a positive effect on the rehabilitation of browse plant species diversity and improved population structure and regeneration potentials of degraded grazing lands. Long-term monitoring and evaluation systems will be required to gain an informed understanding of the roles played by area exclosures in the rehabilitation and conservation of browse palnt species diversity. Keywords: Browse, Rehabilitation, Restoration Background communities and over-browsing by livestock and game Browse plants, beside grasses, constitute one of the animals (Abule et al. 2005). As a result, encroachment cheapest sources of feed for ruminants (Ahamefule et al. by weeds and undesirable plants, which are plant species 2006). Particularly, fodder trees and shrubs could play that are classified as undesirable, noxious, injurious or both ecological and economic roles in livestock produc- poisonous like Lantana camara L. and Prosopis juliflora tion systems (Karki and Goodman 2009). However, the (Sw.) DC (Allen and Allen 1981; Asfaw and Thulin extensive utilization of the browse plants has increased 1989), has become a threat to the livestock production pressure on the native vegetation, resulting in degrad- systems in the Horn of Africa, especially in Ethiopia ation of the resources due to over-utilization by the (Amaha 2003; Gemedo et al. 2006). Gebremedhin (2000) stated that the misuse of natural resources has resulted in very serious land degradation in most places. Improv- * Correspondence: [email protected] Tigray Agricultural Research Institute, Alamata Agriculture Research Center, ing the management of the natural resources providing P.O. Box 56, Alamata, Ethiopia © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Atsbha et al. Ecological Processes (2019) 8:43 Page 2 of 9 ecological services (soil formation, nutrient cycling, and rehabilitation of indigenous browse species following ex- primary production (Alcamo, 2003; Zerihun et al. 2002); closure established on communal grazing lands in South gully stabilization, controlling accelerated soil erosion, Tigray, Ethiopia. reducing flood damage (Nedessa et al. 2005; Wolde et al. 2007) and immediate economic needs are the major re- Materials and methods search and development challenges for the degraded Description of the study area areas of northern Ethiopia in particular and drylands of The study was conducted in the South zone of Tigray se- East Africa in general. lected districts. It is located at 680 km North of Addis A common restoration practice in Ethiopia is the use of Ababa, the capital city of Ethiopia and 180 km South of area exclosure (AE) (Tekle 2001; Tekle and Bekele 2000; Mekele, the capital city of the Tigray regional state. The Asefa et al. 2003;Teferaetal.2005). In the current study, zone consists of five administrative districts, namely Raya we distinguished between small-scale exclosures used for Alamata, Alaje, Endamohoni, Ofla and Raya Azebo. The protecting livestock grazing (Desta and Oba 2004)andthe study was conducted at five sites (Raya Alamata, Emba large-scale multi-purpose degraded areas protected from Alaje, Endamohoni, Ofla and Raya Azebo) (Fig. 1). The human and livestock exploitation. Restoration of biodiver- sample of different sites was selected with the aim of sity using AE has not been evaluated in terms of the ef- encompassing a wide range of ecoregional diversity. The fects of management factors (i.e. AE versus communal Southern Tigray Zone is one of the seven zones of the re- grazing land (CGL)) on indigenous browse plant species gion bordering to the South and West with Amhara (BPS) diversity. We evaluated the restoration of BPS diver- Regional State, to the North with a South Eastern zone of sity in highly degraded mountain landscapes in Southern Tigray and to the East with Afar Regional State. Geo- Tigray, which were previously used for farming and com- graphically, it is located between 12° 15′ and 13° 41′ north munal grazing. latitude and 38° 59′ and 39° 54′ east longitude with an In the places where AE are established, particularly in the altitudinal range of 1350–3925 m.a.s.l. Based on the trad- southern part of the region, area exclosures are among the itional classification system, Southern zone covers Kola, green spots with considerable species diversity (Tefera et al. Weynadega and Dega agro-ecologies that enable to grow 2005; Betru et al. 2005). In exclosures, it is generally be- varied types of crops, livestock and tree species. It covers lieved that all the land resources will be protected from an area of 9446 km2 with a total population of 538,422. degradation. Although the restoration effects of AE have The Southern zone has experienced two rainfall seasons: been well studied (Kindeya 2003; Aerts et al. 2004; the short rainy season locally known as “Belgi” that occurs Descheemaker et al. 2006), chemical composition and usually from February to April and the main rain season digestibility of some browse plant species (Ammar et al. locally described as “Kiremti” that comes during June to 2004;Ahamefuleetal.2006; Melaku et al. 2010; September. On average, the area receives annually about Boufennara et al. 2012;Girmaetal.2015; Weldemariam 600 mm rainfall with a mean annual temperature of 25 °C. and Gebremichael 2015) and use and availability of tree The dominant soil types of the area are Vertisol, Fluvisols, and shrub resources (John and Moses 2005; Teferi et al. Luvisols and Cambisols, which implies the need for site- 2008), whereas there is no study that offers quantitative in- specific management practices to improve the productivity formation that helps to compare AE with the unprotected of the land (Kidane et al. 2016). areas with respect to browsing plant species restoration. In addition, in the Tigray region, Northern Ethiopia, some of Site selection and sampling procedure the studies conducted earlier (Gebremedhin 2000;Emiru A reconnaissance survey was conducted in the second et al. 2002; Kindeya 2003; Aerts et al. 2004; Tefera et al. week of September 2018, to collect baseline information, 2005; Muluberhan et al. 2006; Yayneshet et al. 2009;Wolde observe vegetation distribution and determine the num- and Aynekulu 2011, Wolde et al. 2011b, 2011c; Yayneshet ber of transect lines to be laid. The CGL was located 2011;WoldeandMastewal2013;Tsegayetal.2019;Tesfay 0.5–1 km away from the AE. It is assumed that the AE et al. 2019) were specifically trying to estimate the role of and CGL were homogenous in biophysical factors before AE in the recovery of woody vegetation diversity without the AEs are restricted for rehabilitation and are similar considering specifying indigenous browse species. It is very in topographic and climatic characteristics. The AE was important to have basic information to browse plant species established since 2004 and covers a total area of 500– diversity and biomass production, as these may facilitate 1500 ha, while the CGL covered 200–1300 ha (Southern the efficient and effective use of rangeland resources as live- Zone BOARD 2018). Adjacent to this AE, there is CGL stock feed. Therefore, this study was initiated to generate used by the community with no restriction to access re- quantitative information and thereby to evaluate whether source. Therefore, this study was conducted in these two AE has an impact on the density and diversity of BPS. land-use systems: AE having the restriction and rules of Thus, the objectives of this study were to assess resource access, in which people and grazing animals are Atsbha et al. Ecological Processes (2019) 8:43 Page 3 of 9 Fig. 1 Map of study area (location of study site) permanently kept outside this area, and the nearby CGL species in the field, vernacular names from key infor- having no restriction and rule of resource access. The mants were used and the specimens supported by vou- CGL areas were considered controls, while the AE repre- cher specimens by referring to Edwards et al.
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